Poor germination results can only be the result of negative outside influences after purchasing the seeds and are beyond our control. This does not necessarily mean that the grower is at "fault". Even the most experienced grower can run into unforeseen problems such as fungus infected soil, a technical malfunction on an EC meter, etc. Often growers buy the wrong soil because it is recommended by the manufacturer or retail store (consult our Soil Guide for more info).
Many growers make the mistake of thinking that they need a high ambient humidity for germination or seedlings. The high humidity and lack of fresh ventilation quickly causes fungus in the soil or growing medium and the seeds rot!
b) some or all seeds are intact, but have noticeably changed colour and are darker; some may also have a whitish substance coating the rounded end, or the embryo inside has turned soft or slushy.
You can use a humidity dome/mini-greenhouse as a tray for germination but you must keep the lid half-way open or completely seperate to ensure fresh air exchange and humidity levels below 50%.
Your seeds may not sprout at all, or they may emerge from the soil but die days later. Seedlings may suddenly bend and turn brown from a disease known as “damping off”. Overwatering, poor drainage, and lack of aeration will also increase the likelihood of this.
Handling your cannabis seeds with bare hands can contaminate them with all kinds of nasties like bacteria and fungus. Unfortunately, seeds and seedlings are especially vulnerable to these types of harmful pathogens.
6. TOO MUCH MOISTURE
Why are my seeds not germinating? With our germination troubleshooting guide, you can get to the bottom of why your weed seeds aren’t popping. Avoid these germination mistakes and get your grow off to a great start!
Likewise, when temperatures are too low, this can introduce a whole host of its own problems, including inhibiting seeds from sprouting. Colder temperatures also increase the risk of other plant diseases. What to do about it? If you want to grow outdoors, don’t set plants outside too early. Instead, germinate indoors and allow your seedlings to grow for a few weeks.
If you’re germinating indoors and temperatures are too high, see whether you can get it cooler with some fans or by opening windows. If that doesn’t work, consider an air conditioner for your grow room to keep temperatures at bay.
Enjoyed reading your info re: plants /growing info
Consider buying a sterile soil if you have a major problem, that is not cured by the already mentioned steps.
I label my trays on the outside with a number with sharpie and then draw a diagram on paper that is kept separate of my plants. You should be able to tell what each plant is (more or less) by the time they are ready to transplant. Look up pictures for each plant you know you planted or go to a garden store and look at their plants.
It all started off good, but my seedlings just aren’t getting very big!
If you seed starting medium is lacking in nutrients they will not grow properly. Keep an eye out for the symptoms of some common soil nutrient deficiencies and feed your plants a little bit as they grow.
Thanks for these sage tips! We have some leggy radishes right now that could definitely use to be thinned…now, to find the time!
That’s an excellent tip. I hadn’t heard that before and I’m going to try it now.
Too much moisture allows disease to grow and plants to mold. Once your seeds have germinated, water your seedlings only when the soil is beginning to dry out.